Abstract
Charge transport in poly[2-methoxy-5-(2'-ethyl-hexyloxy)-1,4-phenylene vinylene] is studied by employing the time-of-flight technique. Film morphology plays a key role in determining the charge transport properties. Samples prepared from toluene feature non-dispersive transport. However, after thermal annealing, charge transport is no longer nondispersive and hole mobility drops for about one order of magnitude. Near-field scanning optical microscope images show that annealing enhanced film inhomogeneity. We propose that the inhomogeneity is responsible for the changes in the transport properties.
Original language | English |
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Pages (from-to) | 81-88 |
Number of pages | 8 |
Journal | Organic Electronics |
Volume | 3 |
Issue number | 2 |
DOIs | |
Publication status | Published - Jun 2002 |
Keywords
- luminent conjugated polymers
- Poly(p-phenylene vinylene)s
- hole mobility
- interchain interactions
- aggregation
- efficiency
- performance
- morphology
- molecularly doped polymers
- film morphology
- time-of-flight
- nondispersive hole transport
- near-field optical microscopy
- MEH-PPV
- carrier mobility
- light-emitting-diodes